<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
  <select name="abc" v-model="fruit">
    <option value="苹果">苹果</option>
    <option value="香蕉">香蕉</option>
    <option value="榴莲">榴莲</option>
    <option value="桃子">桃子</option>
  </select>
  <h2>{{fruit}}</h2>
</div>
<script src="../js/vue.js"></script>
<script>
  let app = new Vue({
    el:'#app',
    data:{
      message:'123',
      name:'321',
      fruit:'桃子'
    }
  })
</script>
</body>
</html>